When I render my model in blender the only thing that appears is the blue color i have for the backround
There is an Object in your scene which is set to Wireframe Display mode in the viewport, but when rendered it is being shaded solid. It encompasses all your objects, so basically it hides everything. The object in question is called CloudBounds, and is highlighted in this screenshot:



The camera however is clearly outside of this box:



Probably you have tried to generate clouds using an Add-on which targets Blender Internal render engine? It would explain why there are no nodes on the cycles shader (it still has the button labeled use nodes):



Anyways, if you move that object to a separate layer which is not set as a RenderLayer, or simply hide or delete it, the scene renders again: